A temporary plugging agent adding device for fracturing

Abstract

The utility model discloses a kind of temporary plugging agent adding devices for fracturing, it is related to temporary plugging agent adding device field, including pipeline connection's mixing tank, feeding hopper, the mixing tank is equipped with stirring roll, the feeding hopper is equipped with pressurized injection pump in lower end, the mixing tank, the feeding hopper is equipped with cleaning assembly, the cleaning assembly includes the cleaning pool of being equipped in the feeding hopper one side, the mixing tank and the feeding hopper are all equipped with cleaning spray gun, the cleaning spray gun with the mixing tank and the feeding hopper are all equipped with telescopic plug-in assembly, the cleaning assembly further includes the tank wall cleaning assembly of being equipped in the mixing tank, the cleaning pool and the cleaning spray gun are equipped with circulating cleaning assembly between. Realized the fixed-point flushing of equipment inside, also effectively avoid temporary plugging agent in spray gun mouth attachment or blockage by the telescopic structure of spray gun.

Description

Technical Field

[0001] This utility model relates to the technical field of oil and gas field fracturing equipment, specifically to the field of temporary plugging agent addition devices. Background Technology

[0002] In oil and gas field fracturing operations, temporary plugging agents are key materials for achieving fracture redirection and improving reservoir stimulation uniformity. The accuracy and uniformity of their addition directly affect the fracturing effect and reservoir activation efficiency. The temporary plugging agent addition device is a core auxiliary equipment in fracturing operations. It is mainly used to continuously and stably add temporary plugging agents in different forms, such as dry powder, liquid, and granules, to the fracturing fluid mixing system according to the designed ratio. This ensures uniform mixing of the temporary plugging agent and fracturing fluid before pumping them into the formation to complete the temporary plugging operation. As oil and gas field development extends to deeper and tighter layers, fracturing conditions become increasingly complex, placing higher demands on the stability, reliability, and ease of subsequent maintenance of the temporary plugging agent addition device.

[0003] Currently, the design focus of existing temporary plugging agent dosing devices for fracturing is mainly on the metering accuracy and dosing rate control of the temporary plugging agent. These devices typically consist of a storage mechanism, a metering and conveying mechanism, a mixing interface, and a control unit, which can basically meet the dosing requirements of different types of temporary plugging agents. However, in actual construction, after the operation is completed, a large amount of temporary plugging agent remains on the inner walls of the storage hopper, metering and conveying pipeline, mixing joint, and related valves, especially dry powder and granular temporary plugging agents, which easily adhere to the inner walls of the equipment. Existing dosing devices generally lack dedicated functions for collecting flushing wastewater and cleaning residual temporary plugging agent; they can only achieve preliminary cleaning through simple rinsing, which cannot completely remove the residual material.

[0004] If the aforementioned residual plugging agent is not cleaned up promptly and thoroughly, it will gradually solidify and form scale due to contact with air, moisture, or residual components of fracturing fluid during equipment downtime or subsequent construction. The scale residue will not only clog metering and delivery pipelines and valves, leading to decreased accuracy and difficulty in subsequent plugging agent dosing, but may even cause equipment jamming and affect construction progress. Furthermore, the scale is difficult to remove, accelerating corrosion and wear on the equipment's internal walls, shortening the unit's lifespan, increasing maintenance costs and downtime for repairs. In addition, the indiscriminate discharge of flushing wastewater will cause environmental pollution, failing to meet the relevant requirements for green construction in oil and gas fields. Utility Model Content

[0005] The purpose of this utility model is to provide a device for adding temporary plugging agent for fracturing in order to solve the above-mentioned technical problems.

[0006] To achieve the above objectives, this utility model specifically adopts the following technical solution:

[0007] A fracturing temporary plugging agent addition device includes a mixing tank and a feeding hopper connected by pipelines. The mixing tank is equipped with a stirring roller, and the feeding hopper is equipped with a pressurized injection pump at its lower end. The mixing tank and the feeding hopper are equipped with a cleaning component. The cleaning component includes a cleaning pool located on one side of the feeding hopper. Both the mixing tank and the feeding hopper are equipped with cleaning spray guns. The cleaning spray guns are connected to the mixing tank and the feeding hopper by telescopic insertion components. The cleaning component also includes a tank wall cleaning component located inside the mixing tank, and a circulating cleaning component is provided between the cleaning pool and the cleaning spray guns.

[0008] Through the above scheme, the cleaning component of the temporary plugging agent addition device firstly installs cleaning spray guns inside the mixing tank and the feeding hopper, and combines them with telescopic plug-in components, so that the spray guns can extend into the equipment when cleaning is needed to directly rinse the residual temporary plugging agent, and retract when not cleaning, so as to avoid interfering with normal feeding operations. This design not only realizes targeted rinsing of the equipment, but also effectively avoids the temporary plugging agent from adhering to or clogging the spray gun nozzle through the telescopic structure of the spray gun, thereby improving the reliability and convenience of cleaning.

[0009] Furthermore, the telescopic plug-in assembly includes an assembly channel located on the outer periphery of the upper end of the mixing tank body. The assembly channel extends into the mixing tank and has a torsion spring hinged cover at its end. The assembly channel and the cleaning spray gun are slidably abutted against each other via a sliding groove spline. The assembly channel is provided with a driving component that causes the cleaning spray gun to move along the assembly channel and push open the cover. The feeding hopper is also provided with an assembly channel, a cover, and a driving component, and its structure is the same as that of the mixing tank.

[0010] Through the above scheme, the telescopic plug-in assembly forms an openable and closable channel through the assembly channel and the cover hinged by the torsion spring. The cleaning spray gun moves along the slide spline under the drive of the drive component, which can push open the cover and extend into the equipment. When the cleaning is completed and retracted, the cover automatically closes. This not only ensures the sealing of the equipment during operation and prevents material leakage, but also isolates the spray gun from the internal environment when not in use, avoiding residue adhesion or corrosion of the spray gun, and ensuring that the spray gun can be reused for a long time.

[0011] Furthermore, the assembly channel is inclined upward, the driving component includes a pressure-bearing piston head disposed in the assembly channel, the pressure-bearing piston head also slides against the assembly channel through a sliding groove spline, the tail of the cleaning spray gun is connected to the pressure-bearing piston head, and the tail of the assembly channel is connected to the circulating cleaning assembly through a pipe.

[0012] The above-mentioned design, with its upward-sloping assembly channel and internal pressure-bearing piston head, allows the cleaning fluid to push the piston and spray gun forward when pumped in, achieving hydraulic automatic propulsion without the need for an additional power mechanism. At the same time, through the cooperation of the slide spline, the spray gun remains circumferentially fixed during movement, ensuring stable spray direction, thereby improving the coverage and cleaning efficiency of the rinsing, and the overall structure is simple and reliable.

[0013] Furthermore, a limiting ring is provided at the upward-sloping port of the assembly channel, and the diameter of the limiting ring is smaller than the diameter of the cleaning spray gun.

[0014] The above solution uses a limiting ring with a diameter smaller than that of the cleaning spray gun at the assembly channel port. This prevents the spray gun from completely coming out under pressure, thus providing a safety limit. At the same time, it does not affect the normal extension and retraction of the spray gun or the opening and closing of the cover, further ensuring the stability and safety of the device operation.

[0015] Furthermore, the cover has two symmetrically and vertically arranged at the assembly channel port, and the torsion spring on the cover has a tendency to keep the cover closed at the assembly channel port.

[0016] With the above scheme, the two symmetrically arranged covers are kept in a normally closed state under the action of torsion springs. They are pushed open when the spray gun is extended and automatically closed when it is retracted. This double-cover structure enhances the sealing effect of the channel opening and can effectively prevent temporary plugging agents or foreign objects from entering the assembly channel and causing blockage or wear, thus extending the service life of the drive components.

[0017] Furthermore, the end of the cleaning spray gun is provided with several sets of oblique spray holes.

[0018] The above solution allows the angled spray holes at the end of the cleaning gun to form a rotating and scattering water flow when the cleaning liquid is sprayed out, thereby expanding the rinsing coverage area. In particular, it enables multi-angle rinsing of areas prone to residue, such as tank walls or hopper corners, improving the thoroughness of cleaning and reducing scale residue.

[0019] Furthermore, the circulating cleaning assembly includes an annular pipe disposed around the mixing tank and the feeding hopper. The annular pipe is connected to the assembly channel via a flexible hose. The circulating cleaning assembly also includes a clean water tank and a wastewater tank disposed within the cleaning pool. The clean water tank is connected to the annular pipe via a pumping pipe. A three-way valve is provided at the lower end of the feeding hopper. One end of the three-way valve is connected to the pressurized injection pump, one end is connected to the wastewater tank, and one end is connected to the feeding hopper.

[0020] With the above scheme, the circulating cleaning component is connected to each cleaning spray gun through a ring pipe and a hose, and is equipped with independent clean water tank and wastewater tank. Clean water is pumped to the spray gun for rinsing, while the wastewater after rinsing is switched to the wastewater tank for centralized collection through a three-way valve at the bottom of the feeding hopper. This realizes the circulation of cleaning liquid and centralized treatment of wastewater, which not only saves water, but also avoids environmental pollution caused by the random discharge of rinsing wastewater, and meets the requirements of green construction.

[0021] Furthermore, the stirring roller is vertically arranged in the middle of the mixing tank and driven by a motor. The motor driving the stirring roller is located at the top of the mixing tank. The tank wall cleaning assembly includes a scraper inserted into the outer peripheral side wall of the mixing tank. The scraper is made of a flexible and wear-resistant material. The upper part of the mixing tank is provided with a detachable cover plate. The end of the stirring roller facing the inner wall of the mixing tank has a concave groove that runs from top to bottom. The cross-section of the groove is open to the outside and expands away from the opening. The scraper has a vertically arranged fitting part that fits into the groove.

[0022] With the above solution, the tank wall cleaning component uses a detachable flexible scraper that engages with a groove on the mixing roller. Before cleaning is required, the scraper can be removed from the outer periphery of the mixing tank and fixed by embedding it into the groove on the mixing roller. When the mixing roller rotates, the scraper rotates accordingly and scrapes off the temporary blockage agent adhering to the inner wall of the mixing tank, reducing the accumulation of the temporary blockage agent on the tank wall and facilitating subsequent rinsing. The scraper is made of flexible and wear-resistant material, which ensures the scraping effect while reducing damage to the tank wall. At the same time, the detachable design facilitates replacement and maintenance after wear, further improving the long-term reliability and ease of maintenance of the equipment.

[0023] The beneficial effects of this utility model are as follows: 1. This utility model has a simple structure. The cleaning component of the temporary blockage agent addition device firstly sets up a cleaning spray gun inside the mixing tank and the feeding hopper, and combines it with a telescopic plug-in component, so that the spray gun can extend into the equipment when cleaning is needed to directly rinse the residual temporary blockage agent, and retract when not cleaning, so as to avoid interfering with the normal feeding operation. This design not only realizes the fixed-point rinsing of the equipment, but also effectively avoids the temporary blockage agent from adhering to or clogging the spray gun nozzle through the telescopic structure of the spray gun, thereby improving the reliability and convenience of cleaning. 2. The tank wall cleaning component uses a detachable flexible scraper that engages with the groove on the mixing roller. Before cleaning is required, the scraper can be removed from the outer periphery of the mixing tank and fixed by embedding it into the groove with the mixing roller. When the mixing roller rotates, the scraper rotates accordingly and scrapes off the temporary blockage agent adhering to the inner wall of the mixing tank, reducing the accumulation of temporary blockage agent on the tank wall. Attached Figure Description

[0024] Figure 1 This is a cross-sectional structural diagram of the present invention; Figure 2 This is a cross-sectional structural diagram of the assembly channel section of this application; Reference numerals: 11. Mixing tank; 12. Feeding hopper; 13. Agitating roller; 14. Pressurized injection pump; 15. Cleaning tank; 16. Cleaning spray gun; 17. Assembly channel; 18. Cover; 19. Pressure-bearing piston head; 20. Limiting ring; 21. Annular pipe; 22. Clear water tank; 23. Sewage tank; 24. Three-way valve; 25. Scraper; 26. Cover plate; 27. Fitting groove; 28. Fitting part. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0026] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0027] Example 1 like Figure 1 and Figure 2 As shown, this embodiment provides a device for adding temporary plugging agent for fracturing, including a mixing tank 11 and a feeding hopper 12, which are connected by a pipeline with an electric valve. A vertically mounted stirring roller 13 is installed inside the mixing tank 11, driven by a motor mounted on the top of the mixing tank 11, with a rotation speed ranging from 30 to 60 rpm. A pressurized injection pump 14 is installed at the lower end of the feeding hopper 12 to inject the temporary plugging agent into the pipeline; its outlet pressure is adjustable, typically operating in the range of 0.5-1.0 MPa.

[0028] The device is equipped with a cleaning component for internal cleaning and maintenance. The cleaning component includes a cleaning tank 15 located on one side of the feeding hopper 12, which is divided into a clean water tank 22 and a wastewater tank 23, each with a volume of approximately 2.5 cubic meters. Both the mixing tank 11 and the feeding hopper 12 are equipped with cleaning spray guns 16. Each cleaning spray gun 16 has several sets of angled spray holes at its end, with the axis of the spray holes forming a 30-degree angle with the center line of the spray gun. Telescopic connectors are provided between the cleaning spray guns 16 and both the mixing tank 11 and the feeding hopper 12. These telescopic connectors include an assembly channel 17 located on the outer periphery of the upper end of the mixing tank 11, and a similar assembly channel 17 is also provided on the feeding hopper 12. The assembly channel 17 is inclined upwards, with its axis forming a 15-degree angle with the horizontal plane, and its port extends into the mixing tank 11 or the feeding hopper 12. At the port of each assembly channel 17, there are two symmetrically arranged vertically positioned covers 18. The covers 18 are hinged to the assembly channel 17 by torsion springs, which tend to keep the covers 18 closed at the port of the assembly channel 17. A limiting ring 20 is provided on the inner side of the upwardly inclined port of the assembly channel 17. The diameter of the limiting ring 20 is smaller than the diameter of the cleaning spray gun 16, typically 2-3 mm smaller.

[0029] The assembly channel 17 is equipped with a pressure-bearing piston head 19, which slides against the inner wall of the assembly channel 17 via a sliding spline. The tail of the cleaning spray gun 16 is fixedly connected to the pressure-bearing piston head 19, and the cleaning spray gun 16 also slides against the assembly channel 17 via a sliding spline. The telescopic connector also includes a drive component that moves the cleaning spray gun 16 along the assembly channel 17. This power comes from the cleaning fluid pressure provided by the circulating cleaning component connected to the tail of the assembly channel 17 via a pipe, and the propulsion pressure is generally 0.3-0.6 MPa.

[0030] The circulating cleaning assembly includes an annular pipe 21 with a diameter of DN25, located around the mixing tank 11 and the feeding hopper 12. The annular pipe 21 is connected to the tail ends of each assembly channel 17 via flexible hoses. A clear water tank 22 is connected to the annular pipe 21 via a pumping pipe with a rated flow rate of 5 cubic meters per hour. A three-way valve 24 is located at the lower end of the feeding hopper 12. The three ports of the three-way valve 24 are respectively connected to the inlet of the pressurized injection pump 14, the sewage tank 23, and the outlet of the feeding hopper 12. The valve has a diameter of DN50.

[0031] The cleaning assembly also includes a tank wall cleaning component located within the mixing tank 11. The mixing tank 11 has a removable cover plate 26 on its upper part. The end of the stirring roller 13 facing the inner wall of the mixing tank 11 has an axially recessed, through-hole grooving groove 27. The cover plate 26 is positioned to coincide with the movable position of the groove 27. The cross-section of the groove 27 is open outwards and bulges outwards from the opening, forming a T-shaped groove structure. The tank wall cleaning component includes a scraper 25 made of a flexible, wear-resistant material, such as a 10 mm thick polyurethane rubber sheet. A vertically arranged fitting part 28 is provided on the scraper 25. The shape of the fitting part 28 matches the fitting groove 27, and its cross-section is also T-shaped. The scraper 25 can be inserted through a pre-reserved opening on the outer peripheral side wall of the mixing tank 11 and is fixedly connected by embedding the fitting part 28 into the fitting groove 27 of the stirring roller 13.

[0032] Working principle: The cleaning component of this temporary plugging agent addition device firstly uses a cleaning spray gun 16 installed inside the mixing tank 11 and the feeding hopper 12. Combined with a telescopic connector, the spray gun can extend into the equipment when cleaning is needed. When the cleaning fluid is pumped in, it pushes the piston, causing the spray gun to move forward together, achieving hydraulic automatic propulsion without the need for an additional power mechanism. Simultaneously, through the cooperation of the sliding spline, the spray gun remains circumferentially fixed during movement, ensuring a stable spray direction and directly flushing away residual temporary plugging agent. In non-cleaning states, it retracts. To avoid interfering with normal feeding operations, the cleaning spray gun 16 moves along the slide spline under the drive of the drive component, allowing it to push open the cover 18 and extend into the equipment. When it retracts after cleaning, the cover 18 automatically closes, ensuring the equipment's sealing during operation and preventing material leakage. It also isolates the spray gun from the internal environment when not in use, preventing residue adhesion or corrosion. This design not only achieves targeted cleaning of the equipment's interior but also effectively prevents temporary blockage agent from adhering to or clogging the spray gun nozzle through the spray gun's retractable structure, improving cleaning reliability and convenience. The tank wall cleaning assembly uses a detachable flexible scraper 25 that engages with the fitting groove 27 on the stirring roller 13. Before cleaning, the scraper 25 can be removed from the outer periphery of the mixing tank 11 and fixed to the stirring roller 13 by embedding it into the fitting groove 27 via the fitting part 28. When the stirring roller 13 rotates, the scraper 25 rotates accordingly and scrapes off the temporary blockage agent adhering to the inner wall of the mixing tank 11, reducing the accumulation of temporary blockage agent on the tank wall and facilitating subsequent rinsing.

[0033] It should be noted that the connection relationships of components not specifically mentioned in this application are all assumed to be based on existing technology. Since they do not involve the inventive point and are commonly used in existing technology, the structural connection relationships are not described in detail.

Claims

1. A device for adding temporary plugging agent for fracturing, comprising a mixing tank (11) and a feeding hopper (12) connected by pipelines, wherein the mixing tank (11) is provided with a stirring roller (13), and the feeding hopper (12) is provided with a pressurized injection pump (14) at its lower end, characterized in that, The mixing tank (11) and the feeding hopper (12) are equipped with cleaning components. The cleaning components include a cleaning pool (15) located on one side of the feeding hopper (12). Both the mixing tank (11) and the feeding hopper (12) are equipped with cleaning spray guns (16). The cleaning spray guns (16) are connected to the mixing tank (11) and the feeding hopper (12) by telescopic insertion components. The telescopic insertion components include an assembly channel (17) located on the outer periphery of the upper end of the mixing tank (11). The assembly channel (17) extends into the mixing tank (11) and has a cover (18) hinged by a torsion spring at its end. The assembly channel (17) and the cleaning spray gun (16) are slidably connected by a sliding groove spline. The assembly channel (17) is equipped with a drive mechanism that causes the cleaning spray gun (16) to move along the assembly channel (17) and push open the cover (18). The feeding hopper (12) is also equipped with an assembly channel (17), a cover (18), and a driving component, the structure of which is the same as that of the mixing tank (11); a circulating cleaning assembly is provided between the cleaning pool (15) and the cleaning spray gun (16). The circulating cleaning assembly includes an annular pipe (21) located on the outer periphery of the mixing tank (11) and the feeding hopper (12). The annular pipe (21) is connected to the assembly channel (17) by a hose. The circulating cleaning assembly also includes a clear water pool (22) and a sewage pool (23) located in the cleaning pool (15). The clear water pool (22) is connected to the annular pipe (21) through a pumping pipe. A three-way valve (24) is provided at the lower end of the feeding hopper (12). One end of the three-way valve (24) is connected to the pressurized injection pump (14), one end is connected to the sewage pool (23), and one end is connected to the feeding hopper (12).

2. The device for adding temporary plugging agent for fracturing according to claim 1, characterized in that, The assembly channel (17) is inclined upward. The driving component includes a pressure-bearing piston head (19) disposed in the assembly channel (17). The pressure-bearing piston head (19) is also slidably abutted against the assembly channel (17) through a sliding groove spline. The tail of the cleaning spray gun (16) is connected to the pressure-bearing piston head (19). The tail of the assembly channel (17) is connected to the circulating cleaning assembly through a pipe.

3. The device for adding temporary plugging agent for fracturing according to claim 2, characterized in that, The assembly channel (17) is provided with a limiting ring (20) at the upward inclined port, and the diameter of the limiting ring (20) is smaller than the diameter of the cleaning spray gun (16).

4. The device for adding temporary plugging agent for fracturing according to claim 3, characterized in that, The cover (18) has two symmetrical vertically arranged at the port of the assembly channel (17), and the torsion spring on the cover (18) has a tendency to keep the cover (18) closed at the port of the assembly channel (17).

5. The device for adding temporary plugging agent for fracturing according to claim 3, characterized in that, The cleaning spray gun (16) has several sets of oblique spray holes distributed at its end.

6. The device for adding temporary plugging agent for fracturing according to claim 1, characterized in that, The stirring roller (13) is vertically arranged in the middle of the mixing tank (11) and driven by a motor. The motor driving the stirring roller (13) is located at the top of the mixing tank (11). The cleaning assembly also includes a tank wall cleaning assembly provided inside the mixing tank (11). The tank wall cleaning assembly includes a scraper (25) inserted into the outer peripheral side wall of the mixing tank (11). The scraper (25) is made of flexible wear-resistant material. The upper part of the mixing tank (11) is provided with a detachable cover plate (26). The end of the stirring roller (13) facing the inner wall of the mixing tank (11) is provided with a recessed groove (27) that runs from top to bottom. The cross-section of the groove (27) is open to the outside and expands away from the opening. The scraper (25) is vertically provided with a fitting part (28), which is adapted to the fitting groove (27).

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